ABSTRACT: The present paper deals with the occurrence of a Halimeda bioherm facies represented by five different forms of the genus. The halimedaceans have been identified by thin section analysis of limestones from the middleMiocene (Serravallian) of the Butler Bay Section, Little Andaman Island (Hut Bay), India. All these forms are reported herein for the first time from the Miocene of the northern Indian Ocean. The present record is an important addition to the Halimeda database from this part of the world because specifically from the Cenozoic sediments halimedaceans are poorly known throughout the world. Present day halimedaceans are significant contributors of the carbonate mass of tropical reefs in different parts of the world and they might have played amajor role in maintaining the carbon budget in the middle Miocene.
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